Procharger on 6.2 (Runs like crap) HELP
First off I have ran searches and tried several different solutions but still runs like crap.
So I have 2011 Sierra 6.2L 2wd flex fuel with P1 Procharger, 8lb pulley, Corsa Sport, removed 3rd cat, 89lb Fast injectors and KHP tune.
I did the install myself and drove to KHP to get injectors and then tuned. Now first off truck will hit 8-8.5lbs of boost but surges at idle and acceleration. But KHP did tune in first gear and let out each time at shift so we didn't feel surging, but I did feel surging at idle and he says that's normal. (Its a 500-600rpm surge, that's not normal) On the way home I floored it 1st through 3rd and noticed something didn't feel right and as I let out the SERVICE TRACTION CONTROL - SERVICE STABITRAK - REDUCED ENGINE POWER LIGHTS came on. I limped to side of road and turned off. Waited 30 sec and started up, truck was no longer in limp mode and I drove home. SES light was on and so I pulled codes with scanner. P0120 (throttle body circuit malfunction) I replaced TPS and issue still remains. Surging at idle, surging upon acceleration and then when I floor it for a few seconds the dreaded SERVICE TRACTION CONTROL - SERVICE STABITRAK - REDUCED ENGINE POWER LIGHTS come on with new codes P0068 (MAP/MAF sensor pressure) P0108 (manifold baro pressure). So I check all my PCV and vacuum lines to make sure all are tight and installed according to the Procharger manual and all seem fine. I decided to clean throttle body and Mass air sensor and take for test drive...same scenario everytime. More surging at idle, surging on acceleration, codes etc...It has now done it 4 times.
I have called KHP but he seems to get defensive immediately when all I am trying to do is seek advice and get to the bottom of this i'm not pointing fingers. And he claims his tuning is not the issue. I have no clue at this point....ANY IDEAS?
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